"Wales wants a steel industry"... well, quite, but leaving the EU isn't going to give it one. First of all, we openly avoid manual trade in this country. Just look around - people clamouring for grammars and tutors and private schools, earnestly hoping Tallulah/Horatio does A-levels and a degree - ANY degree, even footballology - because s/he is not going working at a steelworks, or down a mine, or in a sewer or a factory, oh golly gosh no.
'Leave'rs want to fill these manual jobs with Brits. Which Brits? Even if our children could see the longevity and value of a manual trade, good luck convincing your parents you want to drop out of Uni and become a carpenter. I tried it. My mother threatened to disown me and throw me out of the house when I said I didn't want to go to University. I doubt much is different these days.
Also, as you can see from stats and charts, those EU 'forriners' are well-represented not just in hospitality, domestic roles and factory work, but also in scientific research and tech/development/programming. I've no idea why we stopped producing scientists - probably about the time we sent children to school to learn how to get Bs at GCSE rather than think - but the coding scene is even worse.
I know some fab EU programmers. Because they either a) come from countries that teach programming (unlike us), or b) had the common sense to teach themselves (unlike us.) I'm sure many programmers have tales of Brit CVs they receive ("I'd like to apply for your Senior Java Dev position because I really like playing XBox and I can learn the rest on the job, right?" or the one we had from a primary school PE teacher who'd never coded a line in his life but 'desired a change') and the very few that pass muster - programming is like, I dunno, like fruit picking or something. For some reason, our youth don't want to do it or hardly even consider it a viable option.
Schools are trying to teach a bit of HTML in Year 10 but it's not exactly plugging the skill gap. But sure - I bet Saint May can't wait to pour money into the problem. High-quality programming curriculum and teachers for all. I bet there are just oodles of well-paid programmers who wake up one morning and think 'I'd love to teach high school kids'.
Second, you name it, China do it quicker and cheaper. That's all anyone cares about. Unless you can market handcrafted artisan steel, or coal, no one's going to invest in it in the UK. The only solution there is 'fix China', which is kind of enormous and never going to happen. End of. Say goodbye to the mines, the steelworks and whatever other 1950s long-dead industries you think are going to be resurrected. They aren't. Move on to a more viable career. Try coding.